Hi,
We Chinese Wikipedians are now collecting Baidupedia articles which were copied from Chinese Wikipedia. http://zh.wikipedia.org/wiki/Wikipedia:%E7%99%BE%E5%BA%A6%E7%99%BE%E7%A7%91%... You may click the link above to see how many they are. (We put "Featured articles", "Good articles", "DYK and other general articles" in groups.) Baidupedia users not only copied from zh.wp, but also from ja.wp and en.wp. I think we could now do the evidence collection works first, and I hope the list could be useful if one day the WMF takes some action to Baidu.
Regards, Titan